Measuring reflected x-ray absorption fine structure in gold-coated x-ray mirrors

Alan Owens; Sue C. Bayliss; S. Gurman; George W. Fraser; D. Hutt; Kieran J. McCarthy; Alan A. Wells

doi:10.1117/12.193151

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11 November 1994 Measuring reflected x-ray absorption fine structure in gold-coated x-ray mirrors

Alan Owens, Sue C. Bayliss, S. Gurman, George W. Fraser, D. Hutt, Kieran J. McCarthy, Alan A. Wells

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Proceedings Volume 2279, Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics; (1994) https://doi.org/10.1117/12.193151
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

We describe an experiment to quantify reflected X-ray Absorption Fine Structure (XAFS) in the mirrors to be used on the Joint European X-ray Telescope (JET-X). This instrument is due to be launched on the Russian Spectrum-X platform into deep orbit in December 1995. As part of the calibration program, samples of the Wolter type I, X-ray mirrors were taken to the Synchrotron Radiation Source at the Daresbury Laboratory and exposed to monochromatic X- rays across the energy range of the gold M_I - M_V edges (2 keV to 3.5 keV). We outline our research program and present preliminary results of both direct and reflected XAFS measurements at a variety of incident angles. We find that, while the position of the M_II edge occurs within 3 eV of its tabulated value, the M_I, M_III, M_IV and M_V edges are shifted to higher energies by approximately 10 eV, 13 eV, 40 eV and 40 eV, respectively. We attribute these discrepancies to inaccuracies in the field equations used to generate atomic and nuclear data tables.

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Alan Owens, Sue C. Bayliss, S. Gurman, George W. Fraser, D. Hutt, Kieran J. McCarthy, and Alan A. Wells "Measuring reflected x-ray absorption fine structure in gold-coated x-ray mirrors", Proc. SPIE 2279, Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics, (11 November 1994); https://doi.org/10.1117/12.193151

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